[project @ 2000-02-15 13:16:19 by sewardj]

Backend interop fixes:
-- Make Hugs use the same constructor tag numbering as GHC, viz, starting
   at zero.
-- Evaluator.c: when unwinding the stack on entering a constructor,
   return to the scheduler if a RET_{VEC_}{SMALL|BIG} is found on the
   stack.